PR/Advertising short courses or experience in Northern Ireland

Hi I was looking some advice please

I choose to study business with marketing with more innovation entrepreneurship modules, when I really should have chosen to study advertising, public relations etc, the more writing side of business and marketing- I have now realised that I missed out on this opportunity because of my lack of belief in my writing skills but I can do it.

Is there any way you can do like short courses or something what would help give you experience and background into advertising, blog writing or public relations?

Would really appreciate any guidance in advance! )

See the following job profiles for PR/advertising:
https://nationalcareers.service.gov.uk/job-profiles/advertising-media-buyer
https://nationalcareers.service.gov.uk/job-profiles/marketing-manager
https://nationalcareers.service.gov.uk/job-profiles/advertising-account-executive
https://nationalcareers.service.gov.uk/job-profiles/advertising-account-planner
https://nationalcareers.service.gov.uk/job-profiles/advertising-art-director
https://nationalcareers.service.gov.uk/job-profiles/advertising-copywriter
https://nationalcareers.service.gov.uk/job-profiles/advertising-media-planner
https://nationalcareers.service.gov.uk/job-profiles/marketing-executive
https://nationalcareers.service.gov.uk/job-profiles/public-relations-officer
https://nationalcareers.service.gov.uk/job-profiles/marketing-manager
https://www.prospects.ac.uk/job-profiles/advertising-account-executive
https://www.prospects.ac.uk/job-profiles/advertising-account-planner
https://www.prospects.ac.uk/job-profiles/advertising-art-director
https://www.prospects.ac.uk/job-profiles/digital-copywriter
https://www.prospects.ac.uk/job-profiles/advertising-copywriter
https://www.prospects.ac.uk/job-profiles/marketing-executive
https://www.prospects.ac.uk/job-profiles/ppc-specialist
https://www.prospects.ac.uk/job-profiles/media-planner
https://www.prospects.ac.uk/job-profiles/media-buyer
https://www.prospects.ac.uk/job-profiles/public-relations-officer
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-account-executive
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-account-planner
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-art-director
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-copywriter
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-media-buyer
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/advertising-media-planner
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/marketing-executive
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/marketing-manager
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/public-relations-director
https://www.careerpilot.org.uk/job-sectors/sales-marketing/job-profile/public-relations-officer
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/creative/copywriter/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/creative/creative-director/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/creative/junior-creative/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/media-buying/media-buyer/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/new-business/marketing-executive/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/strategic-planning/media-planner/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/strategic-planning/pay-per-click-ppc-executive/
https://ipa.co.uk/knowledge/careers-in-advertising/the-right-role-for-you/strategic-planning/senior-account-planner/

From the above, I would only pick courses that are accredited by profesional bodies that are recognised by the industry (if you only wanted a job). IPA would be the main one for advertising. CIPR for public relations (CRPA is also noteworthy, but I would stick to CIPR mostly).
See the following:
https://ipa.co.uk/courses-qualifications/
https://www.cipr.co.uk/CIPR/CIPR/Learn_Develop/Qualifications/How_and_where_to_study.aspx
https://www.prca.org.uk/training/20-prca-qualifications

Personally, I would still look into getting a qualification from the CIM, since it's internationally recognised and you can go into advertising with it. See: https://www.cim.co.uk/qualifications/. However, the IPA is more specific to advertising.